Transactions . Fig. 9. — Preheater for Water, Utilizing the Radiated Heat of the Arch of a Glass-Furnace. the top of a furnace-arch is rather a ticklish business; and many amanager would not risk it. Much easier and simpler is the recoveryof heat from the waste-gases, as described below. The average temperature of the escaping gases of the open-hearth,according to numerous determinations at various works, is about 700°C.,or from 200° to 300° below that of the heating-furnace gases con-sidered in the earlier parts of this paper. Hence we have to reckonwith a somewhat smaller possible recovery,
Transactions . Fig. 9. — Preheater for Water, Utilizing the Radiated Heat of the Arch of a Glass-Furnace. the top of a furnace-arch is rather a ticklish business; and many amanager would not risk it. Much easier and simpler is the recoveryof heat from the waste-gases, as described below. The average temperature of the escaping gases of the open-hearth,according to numerous determinations at various works, is about 700°C.,or from 200° to 300° below that of the heating-furnace gases con-sidered in the earlier parts of this paper. Hence we have to reckonwith a somewhat smaller possible recovery, inasmuch as the transferof heat through heating-surfaces will be smaller. Yet such a recoveryis not only practicable but profitable, because the quantities of gasupon which it is carried oat are almost always very large. Prof. Dr. Mayer found in his experiments upon the heat-economy 302 GENERATION OF STEAM BY WASTE HEAT FROM FURNACES. of the Martin furnace that during the production of 1,000 kg. ofsteel 66
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Keywords: ., bo, bookcentury1800, bookdecade1870, booksubjectmineralindustries
